737 Flight Crew Operations Manual
Automatic Flight -
System Description
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
4.20.16 D6-27370-866-EGP
800 Feet Radio Altitude
The second A/P must be engaged in CMD by 800 feet RA to execute a dual
channel A/P approach. Otherwise, CMD engagement of the second A/P is
inhibited.
400 Feet Radio Altitude
The stabilizer is automatically trimmed an additional amount nose up. If the A/Ps
subsequently disengage, forward control column force may be required to hold the
desired pitch attitude.
If FLARE is not armed by approximately 350 feet RA, both A/Ps automatically
disengage.
Flare
The A/P flare maneuver starts at approximately 50 feet RA and is completed at
touchdown:
• FLARE engaged is annunciated and F/D command bars retract.
• the A/T begins retarding thrust at approximately 27 feet RA so as to
reach idle at touchdown. A/T FMA annunciates RETARD.
• the A/T automatically disengages approximately 2 seconds after
touchdown.
• the A/P must be manually disengaged after touchdown. Landing roll-out
is executed manually after disengaging the A/P.
Approach (APP) Mode Single A/P
A single A/P ILS approach can be executed by engaging only one A/P in CMD
after pushing the APP mode select switch. Single A/P approach operation is the
same as dual, with the following exceptions:
• full automatic flare and touchdown capability is not available. FLARE
is not annunciated and stabilizer trim bias is not applied
YK981 - YQ456
• if the pilot is flying manually but not following the approach flight
director guidance and then selects an autopilot CMD engagement, the
autopilot reverts to CWS for the pitch and/or roll mode.
YW273, YW274
• if the pilot is flying manually but not following the approach flight
director guidance and then selects an autopilot CMD engagement, the
autopilot reverts to CWS for the pitch and/or roll mode. The approach
mode(s) will then re-arm.
• A/P status of SINGLE CH is annunciated for the entire approach after
localizer capture
• an A/P go–around is not available.
September 15, 2016
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